1964 Valiant Slant 6 to 318 Conversion ?

'63-66 A-Body Products

So looking more into it what do I do about these few things here. I know that that website has the mounts for the 318 but are currently in transition to new owners and are out at least 4-6 weeks. Is there anywhere else I may be able to obtain mounts ?

Next thing is what would I be doing for exhaust manifolds ? I'm getting a 318 but I read there is issues with that is that true ?

Lastly for the floor shifter there is 2 that I looked into either the Hurst pro shifter 2 or the B&M pro ratchet shifter. From what I've seen there all universal. Is there any preference when installing ?

As for the other stuff I'm still looking into it that's including driveshaft radiator and the drop center link

Any other info is really helpful.